Poppet valve tool



Sept. 9, 1947. I N. B. COOK 2,427,045

' POPPET VALVE Tool.

Filed May 9, 1944 Patented Sept. 9, 1947 UNITED STATES PATENT OFFICE POPPET VALVEJTOL.

NathanfB., Cook, Syracuse, Application May 9, 1944,1'Seri`al No. 5343753 (Cl. `it-nttlilf) This invention relatesv to tools for releasing'the Apuppet valves ofinternal combustion engines, 'and yparticularly .overhead valves, and for reassem* bling the 'valves and. their springs, and has for its objecta tool'fincluding a clutch operable 'to clutch the end'of the valve stein, so as to pull upwardly `on the valvest'em and push downwardly on the-spring abutment upon giving la tilting or lever movement to the `"tool, at which time the ltool slidably fulcrums `on the abutment, and also the 'toolhavingrmeans for reassembling the valve and spring assembly and operableto depress the spring abutment against-the-spring and move the valve locks or lock `members -into interlocking coaction with the valve-stem.

The tool here illustratedis'particularly adapted for-overheadvalves, such 'as the type `used 1in the engines in Chevrolet cars, trucks, etc.

The invention consists in the novel features and in the combinations andL constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying. drawings, in which like characters designate corresponding parts in all the views.

Figure 1 is an elevation, partly in section, of this tool and-the contiguous,portionrof the valve assembly showing the tool in its initial position prior to releasing the valve from the spring and spring abutment,

Figure'2 is a view similar vto Figure `1 `showing the operation-ofthe tool in depressing :the spring to free the lock mem-bers "so `'that they can be removed from interlocking engagement with the valve stem.

Figure 3 is a viewu showing the` use of the. tool for reassembling' the valve stem, its spring., abutment and lock members, `the toolV being shown in starting'position.

Figure fi4 is 'a view similar to Figure 3. showing the position of the tool at the time the vparts are assembled;

I designates the valve havingthe usual stem 2 mounted in any-suitable manner in the head 3 of an automotive engine. 4 isa spring abutment on the stemand locked `thereto by lock members 5; and T6 is a spring thrusting in one `direction against the cylinder head 3 in any Well known manner and against the spring abutment 4. The spring abutment of this type is formed With a conical recess about the stem in which the lock members 5 are located. These lock members are arcuate or semi circular in cross-section with their outer surface conical to conform to the conical Walls ofthe recess. They are formed on their rinner'sides with ribs` 8 which interlock in a circumferential groove 9 in the upper end of the stem 2. This is the Vconventional construction and forms no part of the invention.

The invention resides in the tool for assembling `and dismantling the valve unit. Thistool is here `shown as double in the general form of a bar having a footat one end and a head at the other. The foot coacts with the spring abutment to depress the abutment 4 vfor the purpose of removing 'the lock members 5 and disassembling the valve unit. The foot is provided with a clutch operable to clutch the upper end of the valve stem while the tool is being operated as a lever to depress the abutment Il when the tool is fulcruming about the axis of a pivot between the clutch and the lever or foot of the bar. During this operation, the Valve head is thrusting against its seat. The head at the other end of the bar is for the purpose of reassembling the valve spring and lock members. IIl designates the tool as a whole; Il Vthe foot at one end, and I2 the head at the other end. The foot II is here shown as bifurcated, the ends of its` bifurcations being formed with inclined pressure surfaces I3, which sli'dably press on4 the abutment at the corners I?.a of the surfaces I3,

I'lldesignates the clutch, this being shown as a strip pivoted at I5 between the bifurcations and havingv an opening L5 for normally slidably fitting the upper end of the valve rod 2. The clutch is keyed toitspivot pin I5, which is provided with .an operating handle Iiia located outside one of the bifurcations; Whenthe tool is located as seen intFigure 1, wherein the opening in the clutch i4 is ftte'd. over the end` of the stem, and the lever `Illiisoperated into the position shown in Figure 2, :the clutch I4 istilted slightly, causing diametrif callyl opposite sides of the opening to bite into the upper fend of `the4v rod 2. Now, the tool, upon movement upwardly-about the pivot I5 as a ful- `crum takes a lever movement slidably pressing -on the surface I3.'L andin so doing, depresses the ment, spring and lock members on the valve stem, after the valve is placed in the cylinder head. The head I2 is here shown as formed with a bore l1 for receiving the end of the valve stem and a counter bore I8 having a conical or cam shaped bottom wall i9, the end of the head around the counter bore forming a bearing surface at 20 to be pressed against the abutment 4, as seen in Figure 3, after the lock members 5 have been located partly in the recess of the abutment but are out of or above interlocking engagement with the groove 9 in the valve stem. Now upon force being applied to the tool to depress the head l2, the abutment 4 is depressed, compressing the spring 6 and the conical bottom i8 of the counter bore presses against the upper edges of the lock members 5 forcing them also axially along the valve stem until the lock members or the ribs 8 thereon become alined with the groove 9 of the stem, Where further depression cams the lock members radially inward, causing the ribs 8 to interlock in the groove 9. The tool can then be removed.

This tool is particularly simple and consists of few parts for a tool of this type of valve look.

What I claim is:

1. A poppet valve tool for spring-pressed valves in which the spring thrusts against an abutment on the valve stem and the abutment is held in position on the stem by lock members removably carried thereby and interlocked in a groove in the stem, the tool comprising a one piece lever having a shank and a foot at one end of the shank integral therewith formed with an end face for pressing on the abutment, and a clutch member, means pivoting the clutch member to the lever intermediate its ends adjacent the shank end of said foot, said means pivoting said member on an axis transverse of said lever, said clutch member extending from said pivot means and said extension being provided with an opening having at least diametric opposite portions for close engagement of opposite sides of the stem, the axis of said opening and the axis of said pivot means lying in parallel planes with4 the axis of said opening at right angles to the axis of said pivot means, whereby a tilting of said lever with its foot against the abutment will tilt said clutch extension to tilt said diametric opposite portions into biting engagement with the stem.

2, A poppet valve tool for spring-pressed valves in which the spring thrusts against an abutment von the valve stem and the abutment is held in position on the stem by lock members removably carried thereby and interlocked in a groove in the stem, the tool comprising a one piece lever having a shank and a foot at one end of the shank integral therewith formed with an end face for pressing on the abutment, and a clutch member, means pivoting the clutch member to the lever intermediate its ends adjacent the shank end of said foot, said means pivoting said member on an axis transverse of said lever, said clutch member extending from said pivot means and said extension being provided with an opening having at least diametric opposite portions for close engagement of opposite sides of the stem, the axis of said opening and the axis of said pivot means lying in parallel planes with the axis of said opening at right angles to the axis of said pivot means, whereby upon tilting movement of vthe lever with its foot portion against the abutment, the foot portion moves about the fulcrum between it and the clutch member, and the clutch member gripping the valve stem holds the foot portion and the shank from axial movement, and means for tilting the clutch to tilt said diametrically opposite portions into and out of stem gripping position.

3. A poppet valve tool for spring-pressed valves in which the spring thrusts against an abutment on the valve stem and the abutment is held in position on the stem by lock members removably carried thereby and interlocked in a groove in the stem, the tool comprising a one piece lever having a shank and a foot portion at one end of the shank integral therewith, said foot portion being bifurcated and each bifurcation having an end face for pressing on the abutment, and a clutch member, means pivoting the clutch member to the lever intermediate its ends adjacent the shank end of said foot portion between the bifurcations thereof, said means pivoting said `lever on an axis transverse of said lever, said clutch member extending from said pivot means and said extension being provided with an opening having at least diametric opposite portions for close engagement of opposite sides of the stem, the axis of said opening and the axis of said pivot means lying in parallel planes with the axis of said opening at right angles to the axis of said pivot means, whereby upon tilting movement of the lever With its foot portion against the abutment, the foot portion moves about the pivot between it and the clutch member, and the clutch member gripping the valve stem holds the foot portion and the shank portion froml axial movement.

NATHAN B. COOK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,439,530 Schermerhorn et al. Dec. 19, 1922 1,695,610 Ritter Dec. 18, 1928 1,434,437 Hodgkins Nov. 7, 1922 1,760,433 Nordstrom May 27, 1930 1,877,620 Thoman et al. Sept. 13, 1932 650,186 Maxson May 22, 1900 2,245,838 Taylor June 17, 1941 1,779,306 Clark Oct. 21, 1930 1,730,092 Raymond Oct. 1, 1929 1,317,320 Rose Sept. 30, 1919 1,383,057 Ashmun June 28, 1921 1,573,773 Maurer Feb. 16, 1926 1,738,178 Fix Dec. 3, 1929 1,791,961 Frye Feb. 10, 1931 FOREIGN PATENTS Number Country Date 194,931 Great Britain Mar. 22, 1923 493 Great Britain Nov. 5, 1914 

